package cn.itcast.gateway;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @author Suntingxing
 * @date 2022/1/14 23:15
 */
@Order(-1) // 过滤器执行的顺序 越小的越先执行 越大的越后面执行
@Component
public class AuthorizeFilter implements GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1.获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        MultiValueMap<String, String> params = request.getQueryParams(); // 这个就是你的全部请求参数
        // 2.获取参数中的 Authorization参数
        String auth = params.getFirst("Authorization");
        // 3.判断参数值是否等于Admin
        if("admin".equals(auth)){
            // 4.是admin放行
           return chain.filter(exchange); // 放行
        }
        // 4.不是admin拦截
        // 设置状态码
        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
        return exchange.getResponse().setComplete();
    }
}
